Error installing nokogiri gem in ubuntu: Solved

If something resembling below is the output of nokogiri gem install in ubuntu 14.10 or so

/home/praveen/.rvm/rubies/ruby-2.1.0/bin/ruby -r ./siteconf20141213-9698-1nhm3s1.rb extconf.rb
Building nokogiri using packaged libraries.
checking for iconv.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/home/praveen/.rvm/rubies/ruby-2.1.0/bin/ruby
    --help
    --clean
    --use-system-libraries
    --enable-static
    --disable-static
    --with-zlib-dir
    --without-zlib-dir
    --with-zlib-include
    --without-zlib-include=${zlib-dir}/include
    --with-zlib-lib
    --without-zlib-lib=${zlib-dir}/lib
    --enable-cross-build
    --disable-cross-build
/home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:587:in `try_cpp'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:1067:in `block in have_header'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:918:in `block in checking_for'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:351:in `block (2 levels) in postpone'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:321:in `open'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:351:in `block in postpone'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:321:in `open'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:347:in `postpone'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:917:in `checking_for'
    from /home/praveen/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/mkmf.rb:1066:in `have_header'
    from extconf.rb:103:in `have_iconv?'
    from extconf.rb:148:in `block (2 levels) in iconv_prefix'
    from extconf.rb:90:in `preserving_globals'
    from extconf.rb:143:in `block in iconv_prefix'
    from extconf.rb:120:in `each_iconv_idir'
    from extconf.rb:137:in `iconv_prefix'
    from extconf.rb:428:in `block in

'

    from extconf.rb:161:in `block in process_recipe'
    from extconf.rb:154:in `tap'
    from extconf.rb:154:in `process_recipe'
    from extconf.rb:423:in `

'

extconf failed, exit code 1

Install libgmp-dev package with command

sudo apt-get install libgmp-dev

That should solve the problem